ʻO ka nānā ʻana i nā pōmaikaʻi o ka pōlele pōleʻa Kina: hale maʻalahi, sila maikaʻi a pēlā aku
ʻO ka valve ball he mea hoʻohana maʻamau i ka hoʻokele wai, kona ʻano maʻalahi, hoʻopaʻa maikaʻi a me nā pono ʻē aʻe e hoʻohana nui ʻia i ka petroleum, chemical, metallurgy, mana uila a me nā ʻoihana ʻē aʻe i ke kahua o ka hoʻokele wai. E kālailai kēia ʻatikala i nā pono oPāpā kinipōpō Kinaiā ʻoe mai kahi ʻano ʻoihana.